Light guide plate, backlight module and display device

Abstract

A light guide plate, a backlight module and a display device are provided. The light guide plate comprises at least one light incident surface having at least one first light incident surface, a light emitting surface adjacent to the light incident surface, and a plurality of lateral faces adjacent to the light emitting surface. At least one lateral face adjacent to the light emitting surface is disposed with a plurality of reflective microstructures.

What is claimed is: 
     
         1 . A light guide plate, comprising:
 at least one light incident surface having at least one first light incident surface;   a light emitting surface adjacent to the light incident surface; and   a plurality of lateral faces adjacent to the light emitting surface,   wherein at least one lateral face adjacent to the light emitting surface is disposed with a plurality of reflective microstructures.   
     
     
         2 . The light guide plate according to  claim 1 , wherein:
 the reflective microstructure is an optical or electric microstructure reflecting, splitting, scattering, or constraining incident light; and   the reflective microstructure has a dimension in micrometer or sub-micrometer scale.   
     
     
         3 . The light guide plate according to  claim 2 , wherein:
 the reflective microstructures is capable of increasing a number of light reflection points at the at least one lateral face and reducing light loss at the at least one lateral face, such that light efficiency is improved.   
     
     
         4 . The light guide plate according to  claim 3 , wherein:
 the reflective microstructures is capable of further scattering and reflecting light incident onto the reflective microstructures back into the light guide plate, such that rays inside the light guide plate has an increased distribution density and an increased distribution uniformity.   
     
     
         5 . The light guide plate according to  claim 4 , wherein:
 light outputted at the light emitting surface is uniform.   
     
     
         6 . The light guide plate according to  claim 1 , wherein:
 the lateral face includes at least one first lateral face adjacent to the first light incident surface and the light emitting surface; and   the plurality of reflective microstructures are disposed on the at least one first lateral face.   
     
     
         7 . The light guide plate according to  claim 6 , wherein:
 the lateral face includes two first lateral faces adjacent to the first light incident surface and the light emitting surface; and   the plurality of reflective microstructures are disposed on the two first lateral faces.   
     
     
         8 . The light guide plate according to  claim 7 , wherein each first lateral face further includes:
 at least one first position and a second position,   wherein a distribution density of the reflective microstructures at the first position is smaller than a distribution density of the reflective microstructures at the second position.   
     
     
         9 . The light guide plate according to  claim 8 , wherein:
 from the first position to the second position, the reflective microstructures are continuously distributed, and the distribution density of the reflective microstructures gradually increases.   
     
     
         10 . The light guide plate according to  claim 8 , wherein:
 the first position is at one end of the first lateral face and adjacent to the first light incident surface; and   the second position is at the other end of the first lateral face and away from the first light incident surface.   
     
     
         11 . The light guide plate according to  claim 8 , wherein:
 the light incident surface includes a second light incident surface opposite to the first light incident surface,   wherein the first position is at one end of the first lateral face and adjacent to the first light incident surface or adjacent to the second light incident surface, and   the second position has an equal distance to the first light incident surface and the second light incident surface.   
     
     
         12 . The light guide plate according to  claim 1 , wherein the lateral face further includes:
 a second lateral face opposite to the first light incident surface, wherein the reflective microstructures are disposed on the second lateral face.   
     
     
         13 . The light guide plate according to  claim 12 , wherein:
 the plurality of reflective microstructures are uniformly distributed on the second lateral face.   
     
     
         14 . The light guide plate according to  claim 12 , wherein:
 the reflective microstructures are distributed on certain regions of the second lateral face.   
     
     
         15 . The light guide plate according to  claim 1 , wherein:
 the reflective microstructure is a wave-shaped groove microstructure or a dot microstructure.   
     
     
         16 . The light guide plate according to  claim 15  wherein:
 the wave-shaped groove microstructure is a saw-tooth microstructure or an arc-shaped microstructure, 
 wherein the saw-tooth microstructure is disposed towards an inside of the light guide plate, and 
 the arc-shaped microstructure has a concave shape and a vertex of the concave is disposed towards the inside of the light guide plate. 
 
     
     
         17 . The light guide plate according to  claim 15 , wherein:
 the dot microstructure has a concave shape and a vertex of the concave is disposed towards the inside of the light guide plate.   
     
     
         18 . A backlight module, comprising:
 a light guide plate;   wherein the light guide plate includes at least one light incident surface having at least one first light incident surface,   a light emitting surface adjacent to the light incident surface, and   a plurality of lateral faces adjacent to the light emitting surface, wherein at least one lateral face adjacent to the light emitting surface is disposed with a plurality of reflective microstructures.   
     
     
         19 . A display device, comprising:
 a backlight module comprising a light guide plate,   wherein the light guide plate includes at least one light incident surface having at least one first light incident surface,   a light emitting surface adjacent to the light incident surface, and   a plurality of lateral faces adjacent to the light emitting surface, wherein at least one lateral face adjacent to the light emitting surface is disposed with a plurality of reflective microstructures.